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April 22, 1987 AGS 8691-6 <br /> Beacon Service Station #1-502 - Lodi, California <br /> site, according to Applied GeoSystems' prior calculations <br /> (Applied GeoSystems report #8691-3 , dated November 7, 1987 ) . The <br /> purpose of the well was to measure the degree of ground water <br /> contamination at the down-gradient margin of the site, in order <br /> to evaluate the extent of off-site contamination. <br /> FIELD WORK AND METHODS <br /> Soil boring B-5 was drilled to a total depth of approximately 61 <br /> feet below the ground surface. The equipment used for the <br /> borings was a CME-75 drilling rig operated by Datum Exploration, <br /> Inc. , of Pittsburg, California and equipped with 7. 5 inch and 10 <br /> inch diameter hollow-stem augers. The augers were steam-cleaned <br /> prior to use in order to minimize the possibility of down-hole <br /> contamination. <br /> Twelve soil samples were collected and described at the time of <br /> drilling through use of a modified California split-spoon <br /> sampler. These samples, as identified on the attached Boring <br /> Log, were collected at five-foot intervals from the ground <br /> surface to total depth of the borings. Soil samples were <br /> collected by advancing the boring to a point immediately above <br /> the sampling depth, and then driving the sampler into the native <br /> 3 <br /> .4�o,�/ied GeoSystems <br />